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Configuring PROFINET
Information About Configuring PROFINET
PROFINET Device Roles
Figure 15 PROFINET Device Roles
An I/O controller is a programmable logic controller (PLC) that controls I/O devices and exchanges data such as
configuration, alarms, and I/O data through an automation program. The I/O controller and the I/O supervisor exchange
diagnostic information. The I/O controller shares configuration and input/output information with the I/O device and
receives alarms from the I/O device.
PROFINET is designed to be the sole or primary management system platform. Because the I/O controller detects the
switch with the Discovery and Configuration Protocol (DCP), and sets the device name and IP address, you do not need
to enter Cisco IOS commands for the basic configuration. For advanced configurations (for example, QoS, DHCP, and
similar features) you must use Cisco IOS commands on the switch because these features cannot be configured by using
PROFINET.
An I/O supervisor is an engineering station, such as a human machine interface (HMI) or PC, used for commissioning,
monitoring, and diagnostic analysis. The I/O supervisor exchanges diagnostic, status, control, and parameter information
with the I/O device.
An I/O device is a distributed input/output device such as a sensor, an actuator, or a motion controller.
Note: If Profinet DCP cannot detect the switch/PLC/IO mac addresses, temporarily disable the firewall/virus scan from
the Window PC that installed the Siemens STEP7 or TIA Portal.
In a PROFINET I/O system, all the I/O devices communicate over an Ethernet communication network to meet the
automation industry requirement for bus cycle times of less than 100 ms. The network uses switches and full-duplex
data exchange to avoid data collisions.
PROFINET Device Data Exchange
After PROFINET uses DCP to discover devices, including the switch, they establish application relationships (ARs) and
communication relationships (CRs). After a connection is established and information about device parameters is
exchanged, input and output data is exchanged. The switch uses non-real-time CRs to exchange the data attributes
listed in Table 17 on page 129 and Table 18 on page 129.
Ethernet
333318
I/O supervisor
(Programming device/PC)
I/O controller/PLC
I/O device
(Field device)
Commissioning,
Plant diagnostics
Control and exchange
data with I/O devices
Read and write
I/O data
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